把radio的input放在form中，

<form name=theform>

<input type=text name=input1 value="test">

<input type=radio name="radioname" value="0" checked>選擇1
<input type=radio name="radioname" value="1">選擇2

</form>

==javascript讀取radio的值==

<script>

robj=document.theform.myform.radioname;
for(i=0;i<robj.length;i++){
if(robj[i].checked){
alert(robj[i].value);
}

}

</script>

==設置radio哪個被選中==

<script>

function setradio(v)
{
robj=document.form1.radioname;
for(i=0;i<robj.length;i++){
if(robj[i].value==v){
 robj[i].checked=true;
}
}
}
</script>